Electric lighting socket shock insulator



June 6, 1939. R. COOKE 2,161,774

ELECTRIC L'IGH'IING SOCKET SHOCK INSULATOR Filed July 8, 1938 ,iiweriibr W Patented June 6, 1939 PATENT OFFICE ELECTRIC LIGHTING SOCKET SHOCK INSULATOR Ralph Cooke, South Belmar, N. J.

Application July 8, 1938, Serial No. 218,169

4 Claims.

My invention relates to an electric lighting socket shock insulator-this said insulator to be adjusted into different types of medium base sockets, and this insulator is removable from the sockets if so desired.

The object of this invention is to provide an insulator which will render the center contact of medium base sockets inaccessible when the lamp or screw device is removed from the sockets.

Brief description of each full size figure in the drawing:

Fig. 1 is a side elevation of the device of this invention showing the Bakelite" insulating shell I.

Fig. 2 is a sectional view through the center thereof showing the moulded Bakelite insulating shell I, a five prong tempered durable steel spring 2, which has a copper contact plunger rod 3, attached. A circular piece of mica 4, covers the steel spring 2.

Fig. 3 is a bottom plan view thereof showing opening in the Bakelite insulating shell I, and the bottom of the copper contact rod 3.

Fig. 4 is a top plan view thereof showing the Bakelite insulating shell I, the screw head of the copper contact plunger rod 3, and the mica 4, which covers the steel spring 2.

Fig. 5 is a side detail view of the five prong tempered durable steel spring 2 and the copper contact plunger rod 3, which is attached in the center of this same spring 2.

Fig. 6 is a top view of the steel spring 2 and copper rod 3.

Fig. 'l is a bottom view of the same steel spring 2 and copper red 3.

Fig. 8 is a detail view of the circular piece of heat resisting mica 4.

The mechanical description of the article of this invention: The elements making up this invention are Bakelite which is moulded in the shape of a recessed circular insulating shell whose (outside) male threads conform to the (inside) female threads in a medium base electric lighting socket; tempered steel which is in the shape of a five prong steel spring, copper which is in the shape of a contact plunger rod which has an oblong base long enough to contact any type contact in medium base sockets, this said copper rod has a screw slot in its top; mica which is cut in a circular shape to fit over the steel spring.

The parts are assembled thus: The copper rod 3 is first attached in the center of the steel spring 2. This in turn is fitted into the interior of the recessed Bakelite" insulating shell I, so that the copper rod 3 will fit in the oblong opening in the base of the Bakelite shell I. The spring 2 and attached rod 3 are held in place by the groove in the interior of the Bakelite shell I. The mica 4 is then fitted on top of the dished spring 2, and held in place by the same groove in the Bakelite" shell I.

The use and operation of this insulator is as follows: It is first screwed in a medium base socket and adjusted. With the parts in the insulator in position as shown in Figure 2 the center contact in the socket will be electrically disconnected. The steel spring 2 in the insulator holds the copper contact rod 3 in its innermost position when the socket is empty. When however the lamp or screw device is screwed all the way in the socket their base will press against the copper rod 3 in the insulator. This will cause the spring 2 to become depressed and the copper rod 3 will contact the center contact in the socket. When the lamp or screw device is taken out of the socket the spring 2 will return the copper rod 3 to its innermost position inside the insulator.

Having thus described my invention what I claim as new and desire to secure Letters Patents for is:

1. An electric lighting socket shock insulatorthis said insulator being a safety device having outside cylindrical threads to conform to the inside threads of a standard Edison medium base socket-this said insulator being threaded in the socket, and also removable from said socket, and having a recessed body of insulating material a movable tempered steel spring which has a center contact copper rod attached to its center mounted in the recessed body-this said spring and copper rod to make the corresponding contact in the socket inaccessible in a first position of said spring, and accessible in a second position, and the aforementioned spring being covered by a heat resisting circular piece of mica.

2. An electric lighting socket shOCk insulatorthis said insulator having outside cylindrical threads to conform to the inside threads of a standard Edison medium base socketthis said insulator being threaded in the socket, and also removable from said socket, and having a recessed body of insulating material, a movable tempered steel spring which has a copper contact rod attached to its center mounted in the recessed body-this said rod having an oblong 0 base long enough to contact any type contact in medium base socketsthis said spring and copper rod to make contact with the corresponding contact in the socket when pressure is exerted upon it, and disconnect itself from the corresponding contact when pressure is released, and the aforementioned spring being covered by a heat resisting circular piece of mica.

3. An electric lighting socket shock insulat0r this said insulator having outside cylindrical threads to conform to the inside threads of a standard Edison medium base s0cketthis said insulator being threaded in the socket, and also removable from said socket, and having a recessed body of insulating material which has an oblong opening in its base, a movable tempered steel spring which has a center contact copper rod attached to its center mounted in the recessed body-this said spring and rod being de-- pressed outwardly to contact the corresponding contact in the socket when the lamp or screw device is screwed all the Way in the socket-said spring holding the copper rod in its innermost position when the lamp or screw device is takenout of the socket, and the aforementioned spring being covered by a heat resisting circular piece of mica.

4. An electric lighting socket shock insulator this said insulator being a safety device having outside cylindrical threads to conform to the inside threads of a standard Edison medium base socket-this said insulator being threaded in the socket and also removable from said socket and having a recessed body of insulating material, a movable tempered steel spring which has a copper contact rod attached to its center mounted in the recessed bodythis said rod having a screw slot in its topthis said spring and copper rod making electrical connection with the center contact in the socket when pressure is exertedupon it, and being disconnected when pressure is released, and the aforementioned spring being covered by a heat resisting circular piece of mica.

RALPH COOKE. 

